Visual Composer Migration error in 7.3

Hi All,

    We are using  VC applications which were created in portal 7.0 VC tool.We have upgraded one development environment to 7.3,there we initially faced portal runtime issue when ever we click on the application link.So we have followed the below VC transport  from 7.0 to 7.3 guide:

http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/c084eeac-b97a-2c10-e8b0-a27b5608b5d2?QuickLink=index&overridelayout=true

Now application inital screen is coming up but we are facing below issue

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while trying to invoke the method com.sapportals.connector.connection.IConnection.createInteractionEx() of an object loaded from local variable 'connection'

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Naga.